Real Wood Underlay (or wood underlayment) refers to a layer of cushioning material –typically about 3mm – made from closed cell plastic foam, that is laid beneath engineered flooring to provide underfoot comfort, to protect the wood, to add a moisture vapour barrier, to make the flooring last longer and to provide insulation of heat and noise. There are two main benefits of engineered real wood underlay – noise reduction and helping to level the floor to make laying your new floor easier. In addition, it helps to make the room a little warmer and, if you have a concrete floor, underlays with a damp proof moisture membrane help to keep the room dry. All of our engineered real wood underlays are A grade. We do not, and never will, sell anything less than A grade underlay. Considering our incredibly low prices for wood flooring underlay, this is a truly warming thought.